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Four green DDR4 RDIMM modules with gold contacts and black chips

OWC

OWC 64GB (4x16GB) DDR4 2666 ECC Registered RDIMM for Synology Flashstation SA6400 server RAM

SKU CH-Q0S5-KDE10

64 GB kit of four 16 GB DDR4 2666 ECC registered RDIMMs for Synology FlashStation SA6400

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

  • ECC registered design protects data integrity in server workloads
  • 64 GB kit (4 × 16 GB) expands FlashStation SA6400 capacity
  • DDR4 2666 CL19 at 1.2 V matches OEM specifications
  • 288-pin RDIMM form factor fits Synology D4ER01-16G slots
  • Backward compatible with 2133 MHz and 2400 MHz systems

ECC Registered DDR4 for Synology SA6400

This 64GB kit contains four 16GB DDR4 2666 registered DIMMs built to the Synology D4ER01-16G specification. Each module runs at 1.2V with CL19 timing and 2Rx4 organisation. The 288-pin form factor fits the Flashstation SA6400 server and other compatible NAS or workstation platforms that require ECC registered memory.

Replaces slower DDR4 2133 or 2400 modules

The kit is backward compatible with 2133MHz and 2400MHz systems, so it can upgrade existing installations running at those speeds. The jump is worth it when the platform supports 2666MHz operation and the workload benefits from the higher data rate and the 64GB total capacity.

Limited to platforms that accept registered ECC DDR4

Standard desktop motherboards cannot use this memory because they lack the registered buffer and ECC support. It also cannot be mixed with unbuffered or load-reduced DIMMs. Buyers needing non-ECC or consumer SO-DIMM memory must choose a different product.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $412.99
Pricier than about 67% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.45 per GB
Cheaper than about 59% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2R6D42R4064S
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Does this 288-pin DDR4 RDIMM fit the Synology Flashstation SA6400 memory slots?

Yes, the 288-pin DDR4 registered DIMM form factor matches the SA6400 server memory slots.

What is the correct way to install the four 16 GB modules in the SA6400, and what mistake should I avoid?

Populate all four slots as a matched 64 GB kit; do not mix these registered ECC modules with any unbuffered or load-reduced memory.

Will the ECC registered chips on these modules need any periodic replacement or maintenance?

No, the ECC registered DRAM has no moving parts and requires no scheduled replacement under normal server operation.

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